Use the C version of ldexp(). The assembler version was broken in several
ways (ldexp(0.0, 5000) returned +Inf, didn't do normalization/denormalization, etc.).
This commit is contained in:
mycroft
parent
02a48bde49
commit
0ae41d0984
@ -1,7 +1,7 @@
|
||||
# $NetBSD: Makefile.inc,v 1.11 1999/08/29 18:32:36 mycroft Exp $
|
||||
# $NetBSD: Makefile.inc,v 1.12 1999/08/29 19:08:44 mycroft Exp $
|
||||
|
||||
# objects built from assembler sources (need lint stubs)
|
||||
ASSRCS+=alloca.S fabs.S ldexp.S modf.S
|
||||
ASSRCS+=alloca.S fabs.S modf.S
|
||||
|
||||
ASSRCS+=__setjmp14.S
|
||||
ASSRCS+=_setjmp.S
|
||||
@ -12,4 +12,5 @@ SRCS+= setjmp.S sigsetjmp.S
|
||||
|
||||
# objects built from C sources
|
||||
SRCS+= flt_rounds.c fpgetmask.c fpgetround.c fpgetsticky.c fpsetmask.c \
|
||||
fpsetround.c fpsetsticky.c infinity.c frexp.c isinf.c isnan.c bswap64.c
|
||||
fpsetround.c fpsetsticky.c infinity.c frexp.c isinf.c isnan.c ldexp.c \
|
||||
bswap64.c
|
||||
|
||||
@ -1,85 +0,0 @@
|
||||
/* $NetBSD: ldexp.S,v 1.4 1997/05/08 13:38:40 matthias Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1992 Helsinki University of Technology
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* Permission to use, copy, modify and distribute this software and its
|
||||
* documentation is hereby granted, provided that both the copyright
|
||||
* notice and this permission notice appear in all copies of the
|
||||
* software, derivative works or modified versions, and any portions
|
||||
* thereof, and that both notices appear in supporting documentation.
|
||||
*
|
||||
* HELSINKI UNIVERSITY OF TECHNOLOGY ALLOWS FREE USE OF THIS SOFTWARE IN
|
||||
* ITS "AS IS" CONDITION. HELSINKI UNIVERSITY OF TECHNOLOGY DISCLAIMS ANY
|
||||
* LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE
|
||||
* USE OF THIS SOFTWARE.
|
||||
*/
|
||||
/*
|
||||
* HISTORY
|
||||
* 29-Apr-92 Tero Kivinen (kivinen) at Helsinki University of Technology
|
||||
* Created.
|
||||
*/
|
||||
|
||||
/*
|
||||
* double ldexp (value, exp)
|
||||
* double value;
|
||||
* int exp;
|
||||
*
|
||||
* Ldexp returns value*2**exp, if that result is in range.
|
||||
* If underflow occurs, it returns zero. If overflow occurs,
|
||||
* it returns a value of appropriate sign and largest
|
||||
* possible magnitude. In case of either overflow or underflow,
|
||||
* errno is set to ERANGE. Note that errno is not modified if
|
||||
* no error occurs.
|
||||
*/
|
||||
|
||||
#include <machine/asm.h>
|
||||
|
||||
#if defined(LIBC_SCCS)
|
||||
RCSID("$NetBSD: ldexp.S,v 1.4 1997/05/08 13:38:40 matthias Exp $")
|
||||
#endif
|
||||
|
||||
#define ERANGE 34
|
||||
|
||||
ENTRY(ldexp)
|
||||
enter [],8
|
||||
movd 12(fp),r1 /* get value, high 32 bit */
|
||||
lshd -20,r1 /* extract exponent */
|
||||
andd 0x7ff,r1 /* 11 lower bits */
|
||||
subd 1023,r1 /* unbias exponent */
|
||||
movd 16(fp),r0 /* get exp */
|
||||
addd r1,r0 /* add exponents */
|
||||
cmpd r0,1023 /* most positive exponent */
|
||||
bgt 1f /* too large */
|
||||
cmpd r0,-1022 /* most negative exponent */
|
||||
blt 0f /* too small */
|
||||
addd 1023,r0 /* bias exponent */
|
||||
lshd 20,r0 /* convert exponent back to its place */
|
||||
movd 12(fp),r1 /* get value high 32 bit */
|
||||
bicd 0x7ff00000,r1 /* clear exponent */
|
||||
ord r0,r1 /* insert exponent */
|
||||
movd r1,-4(fp) /* put high 32 bit to local variable */
|
||||
movd 8(fp),-8(fp) /* value low 32 bit to local variable */
|
||||
movl -8(fp),f0 /* return value * 2**exp */
|
||||
exit []
|
||||
ret 0 /* neither */
|
||||
|
||||
0: movdl 0d0e0,f0 /* if underflow return 0, set errno */
|
||||
movd ERANGE,r0
|
||||
exit []
|
||||
br cerror
|
||||
|
||||
1: movl 3f(pc),f0 /* if overflow return HUGE */
|
||||
movdl 0d0e0,f2
|
||||
cmpl f2,8(fp) /* check original sign */
|
||||
bgt 2f
|
||||
negl f0,f0 /* if negative, return -HUGE */
|
||||
2: movd ERANGE,r0
|
||||
exit []
|
||||
br cerror
|
||||
|
||||
3: .long 0xffffffff /* the largest number that can */
|
||||
.long 0x7fefffff /* be represented in a long floating */
|
||||
/* number. This is given in hex in order */
|
||||
/* to avoid floating conversions */
|
||||
68
lib/libc/arch/ns32k/gen/ldexp.c
Normal file
68
lib/libc/arch/ns32k/gen/ldexp.c
Normal file
@ -0,0 +1,68 @@
|
||||
/* $NetBSD: ldexp.c,v 1.1 1999/08/29 19:08:44 mycroft Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to The NetBSD Foundation
|
||||
* by Charles M. Hannum.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the NetBSD
|
||||
* Foundation, Inc. and its contributors.
|
||||
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||||
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||||
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
#if defined(LIBC_SCCS) && !defined(lint)
|
||||
__RCSID("$NetBSD: ldexp.c,v 1.1 1999/08/29 19:08:44 mycroft Exp $");
|
||||
#endif /* LIBC_SCCS and not lint */
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <machine/ieee.h>
|
||||
#include <math.h>
|
||||
|
||||
/*
|
||||
* ldexp(value, exp): return value * (2 ** exp).
|
||||
*/
|
||||
double
|
||||
ldexp(value, exp)
|
||||
double value;
|
||||
int exp;
|
||||
{
|
||||
double temp;
|
||||
|
||||
#if __GNUC__ >= 2
|
||||
__asm ("fscale"
|
||||
: "=t" (temp)
|
||||
: "0" (value), "u" ((double)exp));
|
||||
#else
|
||||
__asm ("fscale; fstp %%st(1)"
|
||||
: "=f" (temp)
|
||||
: "f" (value), "0" ((double)exp));
|
||||
#endif
|
||||
return (temp);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user